Electric power-hammer and drilling-machine combined



W. S. PAYNE.

ELECTRIC POWER HAMMER AND DRILLING MACHINE COMBINED.

APPLICATION FILED JAN. 27, I919- Patented Oct. 26,

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W. S. PAYNE. ELECTRIC POWER HAMMER AND DRILLING MACHINE COMBINED.

APPLICATION FILED IAN-21, I919- Patented Oct. 26, 1920.

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ELECTRIC POWER HAMMER AND DRILLING MACHINE COMBINED.

APPLICATION FILED IIIII.27, 1919.

1,356,556. Patented Oct. 26,1920.

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Ht-60 rrzey l'l'ifE. STATES- WALTER S. PAYNE, OF LINCOLN, NEBRASKA.

ELECTRIC POWER-HAMMER AND DRILLING-MACHINE COMBINED.

Specification of Letters Patent.

Patented Oct. 26, 1920.

Application filed January 27, 1919. Serial No. 273,329.

To all whom it may concern:

Be it known that I, VALTER S. PAYNE, a citizen of the United States, residing at Lincoln, in the county of'Lancaster and State of Nebraska, have invented certain new and usefulflllmprovements in Electric Power vention will be apparent during the course of the following description.

In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a side elevation of apparatus embodying my invention, parts being shown in central longitudinal section,

Fig. 2 is a plan view of the same,

Fig. 3 is a transverse sectional view taken on line 3-3 of Fig. 1,

Fig. 4 is a similar view taken on line 4-4 of Fig. 1,

Fig. 5 is a similar view taken on line 55 of Fig. 1,

Fig. 6 is a similar view taken on line 6-6 of Fig 1,

Jig. 7 is a similar View taken on line 7Z of Fig. l,

Fig. 8 is a similar view taken on line 88 of Fig. l,

Fig. 9 is a detail section through the coup s p s,

big. 10 is a side elevation of the hammer casing, and,

Fig. 11 is a similar view or the hammer.

In the drawings wherein for the purpose of illustration is shown a preferred embodiment of my invention, the numeral 5 designates a relatively stationary hammer casing, having a rear portion 6 which is of larger diameter, the enlargement occurring at 'Z'.

Projecting into the hammer casing 5 is a tubular drill spindle 8, extending rear wardly therein. This drill spindle is provided with longitudinally extending openings or slotsI 9, forming spaced arms 10. These arms receive the forward reduced portion 11 of a coupling plug 12, but having no screw threadedengagement therewith. The arms 10 are exteriorly screw threaded, as shown at 12, for screw threaded engagement within the forward end of a rear tube 13, free to revolve within the rear portion 6 ofthe casing 5. The coupling plug 12 is provided with a diametrically enlarged annular portion 14, externally screw-threaded, for engagement with the forward end of the rear tube 13, as shown at 15. It is thus seen that the arms 10 are locked to the rear tube 13 for rotation therewith. The tubular drill spindle is provided near its forward end with a reduced socket orchuck 15, adapted for the reception of a chisel 16, having a hand-grip 17 This chisel is reciprocated in operation and is provided with an elongated groove 18, receiving the inner end of a set screw 19, which prevents it from dropping out of the socket, but allowing the same to reciprocate within restricted limits. When a rotatable drill is employed, instead of the reciprocatory chisel or-tool; the shank of the-drill is inserted within the chuck or socket 15 and clamped therein by the set screw 19, the drill spindle and drill then rotate together. The tubular drill spindle 8 is provided at its forward end with an annular group of air circulating apertures 20, as shown, for the purpose of cooling the part of the p paratus.

Mounted to reciprocate within the'tubular drill spindle 8 is a hammer 21, provided with longitudinal air circulating grooves 22, as shown. This hammer has its forward end adapted to contact with the rear end of the chisel or reciprocatory tool 16, while its rear end is provided with a recess 23, receiving an inner compressible coil spring 24.

The coil spring 24% is arranged within an Y catory and slidable within the 1011- gitudinal openings 9. These arms also slide within recesses 26, formed in the enlarged portion or the coupling plug 12. The

rear ends of the arms 25 are bent inwardly, forming extensions or hooks 27, suitably contacting with the rear end 28, of a reciprocatory cam 29. This reciprocatory cam engages a radial cam 30, these cams being provided with a series of longitudinal air circulating ports 31, to permit of the free circulation of air therethrough.

The cam 29 is rotatable upon a longitudinal driving shaft 32, while the cam 30 is rigidly secured thereto to rotate therewith. The cam 29 cannot rotate with respect to the arms 25 as the hooks 27 fit within segmental recesses 27. The forward end of the driving shaft 32 is journaled within a ball bearing 33, held within the rear end of the coupling plug 12 while the rear end of this shaft is square in cross section and is inserted within an opening in a rotatable member 34, of a thrust ball hearing. The numeral 35 designates a companion memher and 36 the balls between the same. The numeral 37 designates a motor casmg having the hammer casing 5 and its rear portion 6 formed integral therewith, this hammer casing and its rear portion being preferably formed in longitudinal halves, secured together by bolts 38, passed through ears or knuckles 39. The rear tube 13 and rear portion 6 of the hammer casing have annular sets of apertures 13', for the passage of the cooling air.

The rear portion 6 of the hammer casing is provided at its forward end with a longitudinal opening or slot 41, adapted to register with a slot 42, formed in the forward end of the rear tube 13. A reciproca tory lock 42 is mounted to reciprocatewithin the slot 41, and adapted when moved rearwardly to enter the slot 42, thereby locking the rear tube 13 against rotation. The lock 42 has an extension 43, which. is milled, as shown at 44. The extension is provided with a pair of openings or notches 45, for receiving thehead of a spring catch 46. This spring catch is secured to the enlarged portion 6 of the hammer casing. It is thus seen that means are provided to hold the lock 42' in the rear or forward positions. When the lock 42 is shifted to the forward position, it is withdrawn from the slot 42 and hence the rear tube 13 is free to rotate, this look having no holding engagement with the arms 25.

Surrounding the tubular spindle 8, and contacting with the forward end of the hammer casing 5 is a band 47, held in place by a screw 48, operating within a slot 49, as shown in Fig. 5. The screw 48 is anchored to the tubular spindle 8 and thereby permits of a slight turning movement of the band to prevent its longitudinal displacement. The band 47 has a radial opening adapted to receive a bolt 51, carried by a leaf spring 52, secured .to the band, as

secured to the shaft 32.

shown at 53. This bolt is adapted for insertion within openings 54 and 55, formed in the tubular spindle 8 and hamme 21. It thus seen that when the bolt 51 enters the openings 54 and 55, the hammer 21 will be locked against reciprocatory movement with respect to the tubular spindle 8. \Vhen the bolt 51 is withdrawn from these openings, the band 47 may be turned for a slight distance, thereby preventing the bolt from improperly reentering these openings.

The numeral 56 designates a gear casing member, contacting with the enlarged portion 6 of the hammer casing, and with the motor casing 37, and the numeral 57 designates a co-aeting gear casing member, these gear casing members being secured together by screws or bolts 58 or the like, as is obvious. Arranged within the gear case mem-- hers is an upper larger gear 59, rigidly This larger gear is driven by a similar gear 60, rigidly secured to a shaft 61 journaled through bearings 62. The shaft 61 has a larger gear 63 rigidly secured thereto which is driven by a similar gear 64.

The numeral 65 designates the armature shaft of a motor having the small gear 64 rigidly secured thereto. This armature shaft is journaled through suitable bearings 65' and 66. The gear casing 37 has air inlet openings 67 and air is. drawn in through these openings by a fan 68 and discharge through openings 69. The numeral 70 designates the field windings of the motor and 71 the contact brushes.

The circuit for the motor comprises a source of current 72, to one pole of which is connected a wire 73 while a wire '74 is connected with the other pole. The wires 73 and 74 are connected with plugs 75 and 76, as is well known. The plug 75, as shown in Fig. 1, has connection with a wire 77 connected with a stationary contact 74. The wire 77 has a fuse plug 75' connected therein. The numeral 78 designates a stationary contact connected with a wire 79, connected with the field winding 70, and with one-contact brush 71. The other contact brush 71 has connection with a wire 80, which is connected with the plug 76.

The contact elements 74 and 78 are arranged with a hollow handle or hand-gr1p 79, receiving in its transverse portion a contact lever 80, pivoted thereto, as shown at 81. The upper end of the contact lever is moved forwardly by a spring 82 and it is provided at its upper end with a forwardly projecting extension 83, for engagement with the finger, to' move it rearwardly.

The lower end of the contact lever 80' has permanent slidable engagement with the contact 78 and is adapted to be shifted into engagement with the contact 74, to complete the circuit and start the motor.

its pivot to bring the lower end thereof into engagement with the stationary contact 74, for closing the circuit.

hen it is desired to use the apparatus as a rotary drill, the lock 42 ismoved forwardly out of the slot 4-2 and the rear tube 13 is free to rotate. The band 47 is turned sufficiently to cause bolt 51 to enter the openings 54 and 55, thereby locking the tubular spindle 8 and hammer 21 together for rotation. It is thus seen that the tubular spin- 1 dle 8, hammer 21, arms 25, tube 13 secured to the coupling block 12 and arms 10 of the spindle 8 and the two cams 29 and 30 are locked for rotation together, as a unit. When the motor is started this unit is revolved, and a drill may be placed in the chuck 15'.

It is to be understood that the form of my invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. A combined reciprocatory hammer and rotary drill, comprising a relatively sta: tionary casing, a tubular spindle arranged therein and adapted to rotate with relation thereto, means to lock the tubular spindle against rotation, a reciprocatory hammer arranged within the tubular spindle, means to lock the hammer to the tubular spindle so that it cannot reciprocate with relation thereto, a tool chuck carried by the tubular spindle, and means to reciprocate the hammer when the tubular spindle is locked against rotation and the hammer is free to reciprocate and to rotate the tubular spindle when it is free to rotate and the hammer is locked to the tubular spindle against reciprocatory motion with relation thereto.

2. A combined reoiprocatory hammer and rotary drill, comprising a stationary casing,

a rotatable tubular spindle arranged therein, means adapted to lock the tubular spindle against rotation, a reciprocatory hammer arranged within the tubular spindle, means to lock the hammer to the tubular spindle, yielding means to move the hammer in one direction, longitudinal arms connected with the hammer and extending rearwardly therefrom, a reciprocatory cam connected with the hammer arms, a rotatable cam contacting with the-reciprocatory cam, and means to drive the rotatable cam.

8. A combined reciprocatory hammer and rotary drill, comprising a stationary casing, a rotatable tubular spindle arranged therein and having longitudinal openings, means adapted to lockthe tubular spindle against rotation, a reciprocatory hammer arranged within the tubular spindle and having longitudinal arms operating within the longitudinal openings, means adapted to lock the hammer to the tubular spindle, a plug connected with the tubular spindle and having openings formed therein for the passage of the hammer arms, yielding means arranged between the plug and hammer, a reciprocatory cam engaging the rear ends of the hammer arms, a rotary cam contacting with the reciprocatory cam, and means to rotate the rotary cam.

4:. A combined reciprocatory hammer and rotary drill, comprising a stationary casing, arotatable tubular spindle arranged therein and having longitudinal openings, a rotatable rear tube mounted within the sta- 'coil springs, longitudinal arms secured to the hammer and operating within the openings of the tubular spindle and openings in the coupling plug, a reciprocatory cam engaging the arms of the hammer, a rotatable cam engaging the first named cam, means to drive the rotatable cam, and means to lock the hammer against reciprocatory movement with relation to the tubular spindle.

5. A hammer of the character described, comprising a relatively stationary casing provided near its rear end with air circulating openings, a tubular spindle loosely mounted within the casing and having at its forward end a socket and air circulating openings disposed rearwardly of the socket, a reciprocatory hammer disposed within the casing and having longitudinal air circulating openings, yielding means to move the hammer in one direction, and means to move the hammer rearwardly ina sesses;

eluding a pair of coaeting cams, said cams having l gitndinal air circulating open- 'ngs.

6. a hamm r of the character described, comprising a stationary easing, a tubular spindle rotatable within the casing and provided at its forward end with a socket, a plug connected, with the tubular spindle and arranged Within the casing and having a recess formed in one side thereof. a reciproentory hammer mounted to slide within the tubular spindle and provided with arms, yielding means arranged Within the tubular spindle and disposed between the hammer and the ping a hearing held Within the recess or the plug, an operating shaft having one end thereof extending into the bearing, a reciprocatory cam rotatable nponv the shaft and connected with the arms, a rotatebiecam driven by the shaft and engaging the reciprocatory cam, means to drive the operating shaft, and means to control the rotation of the spindie tion of the hammer in testimony whereof I atfix my signature in presence of two Witnesses.

WALTER- S. PAYNE.

and the reciproca- XF?" v itnesses.

ALANsoN CHAPMAN,

RUTH THURSTON. 

